A battery casing assembly and a battery

Abstract

This invention relates to the field of battery technology, specifically disclosing a battery casing assembly and a battery. The battery casing assembly includes a battery casing, a first plastic part, a second plastic part, and terminals. The terminals are located within a mounting cavity of the battery casing, and a first mounting hole is provided on one wall of the battery casing. The first plastic part is disposed outside the mounting cavity, and the second plastic part is disposed inside the mounting cavity. The terminals are located on the side of the first plastic part facing away from the battery casing, and the tabs of the terminals pass through the second plastic part, the first mounting hole, and the first plastic part before connecting to the terminals. Because the terminals do not occupy space inside the battery casing, the volume of the terminals is increased, improving the energy density of the battery. Furthermore, the second plastic part has a tab-shaping structure, which can retract the tabs, resulting in a good overall shape and preventing short-circuit contact between the tabs and the battery casing, thus ensuring high safety. This invention also provides a battery including the above-described battery casing assembly.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery casing assembly and a battery. Background Technology

[0002] In lithium-ion batteries, the connecting piece and one end of the terminal are typically located inside the battery casing, while the other end of the terminal passes through the battery casing and connects to an external circuit to lead out the electrode assembly, enabling the battery to supply power or store energy. A lower plastic component is located between the end of the terminal inside the battery casing and the casing, insulating the terminal from the casing. This lower plastic component is also located inside the battery casing.

[0003] Because one end of the terminal post is located inside the battery casing, and the lower plastic component is quite thick, the terminal post and the lower plastic component occupy part of the internal space of the battery casing. This results in limited space for the electrode assembly, low space utilization within the battery casing, and low energy density of the battery. Furthermore, when the electrode tabs pass through the lower plastic component and the battery casing, the lack of support may cause deformation of the tabs, posing a short-circuit risk between the tabs and the battery casing. Summary of the Invention

[0004] The purpose of this invention is to provide a battery casing assembly and a battery, in which the terminals do not occupy the internal space of the battery casing, the volume of the electrode assembly is increased, the space utilization rate is high, and the energy density of the battery is high. Furthermore, the electrode tabs have a good shape, making it less likely for them to overlap and short-circuit with the battery casing, thus ensuring high battery safety.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On one hand, the present invention provides a battery housing assembly, comprising:

[0007] The battery casing has a hollow interior forming a mounting cavity. One side of the battery casing has an opening that communicates with the mounting cavity. The electrode assembly is inserted into the mounting cavity through the opening. One wall of the battery casing has a first mounting hole.

[0008] A first plastic component is disposed outside the mounting cavity. The first plastic component includes a first plastic component body, and the first plastic component body is provided with a first through hole.

[0009] The second plastic part is disposed in the mounting cavity. The second plastic part includes a second plastic part body, on which a second through hole and a tab shaping structure are provided. The tab shaping structure is disposed in the circumferential direction of the second through hole, and the tab shaping structure is located on the side of the second plastic part body away from the battery casing.

[0010] The electrode post is located on the side of the first plastic part away from the battery casing. The electrode tabs of the electrode assembly pass through the second through hole, the first mounting hole and the first through hole and are connected to the electrode post.

[0011] Optionally, the battery housing includes a top wall and a peripheral side wall, the top wall and the peripheral side wall forming the mounting cavity, and the top wall is provided with the first mounting hole.

[0012] Optionally, the electrode shaping structure includes two guide plates, which are respectively disposed on both sides of the second through hole, and the two guide plates are inclined in a direction away from the axis of the second through hole. Along the direction away from the second through hole, a flared mouth with a gradually widening opening is formed between the two guide plates. The larger end of the flared mouth faces the electrode assembly, and the smaller end of the flared mouth is connected to the second plastic body. The electrode is inserted into the flared mouth.

[0013] The included angle between the guide plate and the axis of the second through hole is α, and the value of α is in the range of 45°≤α≤87°.

[0014] Optionally, the second plastic part body is provided with a support structure on the side near the top wall. The support structure includes a connecting plate and a support plate. The connecting plate is connected to the tab shaping structure. The support plate is disposed on the end face of the connecting plate near the top wall and abuts against the top wall.

[0015] Wherein, along the first direction, the distance between the end face of the support plate away from the guide plate and the end of the guide plate near the support plate is e, and the value of e is in the range of 0.5mm≤e≤20mm;

[0016] And / or, along the second direction, the distance between the end face of the connecting plate away from the top wall and the end face of the second plastic part body away from the top wall is f, and the value of f is in the range of 0mm≤f≤5mm.

[0017] Optionally, the first plastic part body is provided with an overlapping part in the circumferential direction, and the top wall is provided with a groove on the end face opposite to the second plastic part, and the overlapping part is embedded in the groove and fits against the bottom wall of the groove.

[0018] Wherein, along the second direction, the thickness of the top wall is H, and the distance between the end face of the overlapping part away from the second plastic part and the end face of the top wall away from the second plastic part is b, and the value range of b satisfies: -1mm≤b≤0.5H, 1mm≤H≤3mm;

[0019] And / or, along the first direction and the third direction, the width of the overlapping portion is c, and the value of c is within the range of: 0mm≤c≤10mm.

[0020] Optionally, the first plastic body has a first flange on the side near the top wall, the first flange is disposed in the circumference of the first through hole and extends into the first mounting hole, the second plastic body has a second flange on the side near the top wall, the second flange is disposed in the circumference of the second through hole and extends into the first mounting hole, the second flange and the first flange are fitted together, and one of the first flange and the second flange is in contact with the inner wall of the first mounting hole.

[0021] Optionally, the first through hole on the first plastic part body is provided with multiple spacings, and the second through hole and the tab shaping structure on the second plastic part body are provided with multiple spacings, and the first through hole, the second through hole and the tab shaping structure correspond one-to-one.

[0022] Optionally, the first plastic part body is provided with a third flange and a connecting rib on the side opposite to the second plastic part. The third flange is disposed in the circumferential direction of the first through hole. The two ends of the connecting rib are respectively connected to two adjacent third flanges. The third flange, the connecting rib and the first plastic part body form a mounting groove, and at least a portion of the pole post is embedded in the mounting groove.

[0023] Optionally, the first plastic part and the battery casing are heat-fused together, and the second plastic part and the battery casing are heat-fused together.

[0024] On the other hand, the present invention provides a battery including a cover plate, an electrode assembly, and a battery housing assembly as described in any of the above embodiments, wherein the cover plate is connected to an opening in the battery housing, and the electrode assembly is encapsulated within a mounting cavity of the battery housing.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention provides a battery casing assembly, including a battery casing, a first plastic part, a second plastic part, and terminals. The terminal assembly is inserted into the mounting cavity of the battery casing through an opening, and a first mounting hole is provided on one wall of the battery casing. The first plastic part is disposed outside the mounting cavity, and the second plastic part is disposed inside the mounting cavity. The terminals are located on the side of the first plastic part facing away from the battery casing, and the tabs of the terminal assembly pass through the second plastic part, the first mounting hole, and the first plastic part before connecting to the terminals. Because the terminals are disposed outside the mounting cavity of the battery casing, they do not occupy internal space of the battery casing, increasing the volume of the terminal assembly and improving space utilization, which helps to improve the energy density of the battery. Furthermore, the second plastic part has a tab-shaping structure that can retract the tabs, resulting in a good overall shape and preventing short-circuit contact between the tabs and the battery casing, thus ensuring high battery safety.

[0027] This invention also provides a battery, including a cover plate, an electrode assembly, and the aforementioned battery housing assembly. The cover plate is connected to the opening of the battery housing to encapsulate the electrode assembly within the mounting cavity of the battery housing. By employing the aforementioned battery housing assembly, the space utilization within the mounting cavity of the battery housing is high, the volume of the electrode assembly is increased, and the energy density of the battery is high. Furthermore, the tab shaping structure on the second plastic part can retract the tabs, resulting in a good overall shape of the tabs, and short-circuit connections are less likely to occur between the tabs and the battery housing, thus ensuring good battery safety. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the battery casing assembly provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is an exploded view of the battery casing assembly provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is an exploded view of the battery casing assembly provided in Embodiment 1 of the present invention from another perspective;

[0032] Figure 4 This is a top view of the battery housing assembly provided in Embodiment 1 of the present invention;

[0033] Figure 5 for Figure 4 Cross-sectional view of section AA;

[0034] Figure 6 for Figure 5 A magnified view of a section at point C;

[0035] Figure 7 for Figure 4 Cross-sectional view of section BB in the middle;

[0036] Figure 8 for Figure 7 A magnified view of a section at point D;

[0037] Figure 9 This is a schematic diagram of the structure of the second plastic part provided in Embodiment 1 of the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of the first plastic part provided in Embodiment 1 of the present invention;

[0039] Figure 11 This is a cross-sectional view of the battery casing assembly provided in Embodiment 2 of the present invention;

[0040] Figure 12 for Figure 11 A magnified view of a section at point E in the middle;

[0041] Figure 13 This is a cross-sectional view of the battery casing assembly provided in Embodiment 3 of the present invention;

[0042] Figure 14 for Figure 13 A magnified view of a section at point F in the middle;

[0043] Figure 15 This is a cross-sectional view of the battery casing assembly provided in Embodiment 4 of the present invention;

[0044] Figure 16 for Figure 15 A magnified view of a section at point G.

[0045] In the picture:

[0046] 100. Battery casing; 110. Top wall; 111. First mounting hole; 112. Settling groove; 113. First fixing groove; 115. Second mounting hole; 116. Support rib; 117. First injection hole; 120. Peripheral side wall; 121. Opening;

[0047] 200, First plastic part; 210, First plastic part body; 211, First through hole; 220, Overlapping part; 230, First flange; 231, First insertion groove; 240, Connecting rib; 241, Mounting groove; 250, Third flange; 260, First weld pillar;

[0048] 300, Second plastic part; 310, Second plastic part body; 311, Second through hole; 312, Tab shaping structure; 3121, Guide plate; 3122, Flared mouth; 313, Support structure; 3131, Connecting plate; 3132, Support plate; 320, Second flange; 321, Second insertion groove; 330, Second weld pillar; 340, Vent hole;

[0049] 400. Explosion-proof valve. Detailed Implementation

[0050] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] Example 1

[0055] like Figures 1-3 As shown, this embodiment provides a battery housing assembly, which includes a battery housing 100, a first plastic part 200, a second plastic part 300, and a terminal post.

[0056] The battery casing 100 has a hollow interior forming an installation cavity. One side of the battery casing 100 has an opening 121 communicating with the installation cavity. The electrode assembly is inserted into the installation cavity through the opening 121. One wall of the battery casing 100 has a first installation hole 111. A first plastic part 200 is disposed outside the installation cavity. The first plastic part 200 includes a first plastic part body 210, which has a first through hole 211. A second plastic part 300 is disposed inside the installation cavity. The second plastic part 300 includes a second plastic part body 310, which has a second through hole 311 and a tab shaping structure 312. The tab shaping structure 312 is disposed circumferentially around the second through hole 311 and is located on the side of the second plastic part body 310 away from the battery casing 100. The terminal post is flat and located on the side of the first plastic part 200 away from the battery housing 100. The electrode tabs of the electrode group pass through the second through hole 311, the first mounting hole 111 and the first through hole 211 and are connected to the terminal post. The terminal post connects the electrode group to the external circuit.

[0057] Since the electrode posts in this embodiment are located outside the mounting cavity of the battery housing 100, they do not occupy the internal space of the battery housing 100. This increases the volume of the electrode assembly and improves the space utilization of the mounting cavity, thus helping to increase the energy density of the battery. Furthermore, the electrode posts are flat and extend along the second direction (i.e.,...). Figures 1-3 The thickness of the battery housing assembly (in the Z-axis direction shown in the diagram) is relatively thin, so the overall size of the battery housing assembly along the second direction is small. When the battery with this battery housing assembly is arranged in the whole battery pack, the space utilization is high and the energy density is large.

[0058] Furthermore, since the second through hole 311 on the second plastic body 310 is provided with a tab shaping structure 312 in the circumferential direction, the tab can be gathered into the second through hole 311 through the tab shaping structure 312, which provides good guidance when the tab is inserted into the second through hole 311, and the overall shape of the tab is good. In addition, the tab shaping structure 312 can also support the tab and prevent the tab from short-circuiting and connecting with the battery casing 100, thus ensuring the safety of the battery.

[0059] As an alternative, the battery casing 100 includes a top wall 110 and a peripheral side wall 120. One end of the peripheral side wall 120 is connected to the top wall 110, and the other end of the peripheral side wall 120 forms the opening 121. The top wall 110 and the peripheral side wall 120 are connected to jointly form the mounting cavity. A first mounting hole 111 is provided on the top wall 110. A first plastic part 200 and a second plastic part 300 are respectively provided on the top wall 110 along a second direction. Figures 1-3 On both sides of the Z-axis direction shown, the second plastic part 300 is located in the mounting cavity, and the electrode ear shaping structure 312 on the body 310 of the second plastic part faces the electrode group.

[0060] See Figure 4, Figures 7-9 In this embodiment, the tab shaping structure 312 includes two guide plates 3121, which are respectively disposed in the second through hole 311 along the first direction (i.e., Figure 4 , Figure 7 As shown in the Y-axis direction, the two guide plates 3121 are inclined in a direction away from the axis of the second through hole 311. Along the direction away from the second through hole 311, the two guide plates 3121 form a gradually widening flared mouth 3122. The larger end of the flared mouth 3122 faces the electrode assembly, and the smaller end of the flared mouth 3122 is connected to the second plastic body 310. The electrode tab is inserted into the flared mouth 3122. During installation, the electrode tab is inserted into the second through hole 311 from the larger end of the flared mouth 3122. Along the direction close to the second through hole 311, the opening of the flared mouth 3122 gradually narrows. Therefore, when the electrode tab is inserted into the flared mouth 3122, the guide plates 3121 on both sides of the flared mouth 3122 can effectively gather the electrode tab into the second through hole 311. The electrode tab does not need to be bent within the battery casing 100, and the overall shape is good.

[0061] The included angle between the axis of the guide plate 3121 and the axis of the second through hole 311 is α, and the value of α is in the range of 45°≤α≤87°. For example, the value of α can be 45°, 50°, 60°, 70°, 80°, 87°, etc. By controlling the value of α within the above range, it can be ensured that the tab shaping structure 312 effectively conceals the tab within the second through hole 311. It should be noted that when the value of α is too large, it will not have a good shaping effect on the tab; when the value of α is too small, it will increase the height of the second plastic part 300 along the second direction (i.e.,...). Figures 1-3 (The Z-axis direction is shown in the figure).

[0062] The following tests were conducted on battery samples from some specific implementation schemes to investigate the effect of the value of parameter α on the tab shaping effect. The results are shown in Table 1.

[0063] Table 1

[0064]

[0065] The test results show that in sample 1, the value of α is less than the minimum value of its set range of 45°≤α≤87°. The CT test shows that the tabs have a poor folding effect in the battery casing 100. The tabs may be inserted upside down into the electrode group, which poses a risk of short circuit in the electrode group and results in a defective product.

[0066] In samples 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, the value of α was within its set range of 45°≤α≤87°. CT test showed that the tabs had a good folding effect within the battery casing 100, the shape of the tabs was good, and no cases of tabs being inserted backwards into the electrode assembly were found, indicating that the product was good.

[0067] In sample 12, the value of α is greater than the maximum value of its set range of 45°≤α≤87°. CT test shows that the tabs have a poor folding effect in the battery housing 100. The tab shaping structure 312 has almost no shaping effect on the tabs, and there is a risk of short circuit between the tabs and the battery housing 100. The product is defective.

[0068] The second plastic part body 310 has a support structure 313 on the side near the top wall 110. The support structure 313 includes a connecting plate 3131 and a support plate 3132. The connecting plate 3131 is connected to the guide plate 3121 of the tab shaping structure 312. The support plate 3132 is disposed on the end face of the connecting plate 3131 near the top wall 110 and abuts against the top wall 110. The support structure 313 can provide good support for the tab shaping structure 312, ensuring that the tab shaping structure 312 has high mechanical strength and is not easily deformed.

[0069] In this context, along the first direction, the distance between the end face of the support plate 3132 facing away from the guide plate 3121 and the end of the guide plate 3121 near the support plate 3132 is denoted as e, and the value of e ranges from 0.5mm to e ≤ 20mm. For example, the value of e can be 0.5mm, 1.0mm, 5mm, 10mm, 15mm, or 20mm, and can be adjusted according to the dimensions of the second plastic part 300 along the first direction; these will not be listed individually here. It should be noted that the value of e should not be too small, otherwise the connecting plate 3131 will be too sharp and may easily damage the electrode tabs or electrode assembly. Of course, the value of e should also not be too large, otherwise it will occupy the space of the electrode tab shaping structure 312 along the first direction, increasing the height of the electrode tab shaping structure 312 along the second direction and potentially damaging the electrode assembly.

[0070] Furthermore, along the second direction ( Figure 7(As shown in the Z-axis direction), the distance between the end face of the connecting plate 3131 facing away from the top wall 110 and the end face of the second plastic body 310 facing away from the top wall 110 is f, and the value of f is in the range of 0mm≤f≤5mm. For example, the value of f can be 0mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm, 4.0mm or 5.0mm. It should be noted that the value of f cannot be less than 0mm, otherwise the tab shaping structure 312 will protrude from the end face of the second plastic body 310 near the electrode group, which may easily damage the electrode group. The value of f should also not be too large, otherwise the tilt angle of the guide plate 3121 will be too large, the structure of the tab will be relatively loose, the shaping effect of the tab shaping structure 312 on the tab will be poor, the shape of the tab in the battery housing 100 will be poor, and it will be easy for the tab to short-circuit with the battery housing 100.

[0071] The following tests were conducted on battery samples from some specific implementation schemes to investigate the influence of the values ​​of parameters e and f on the tab shaping effect. The results are shown in Table 2.

[0072] Table 2

[0073]

[0074] The test results showed that in sample 1, the value of e was less than the minimum value of the set range 0.5mm≤e≤20mm. After disassembling the battery, it was found that the diaphragm at the connection plate 3131 was damaged and broken, which posed a short circuit risk and the product was defective.

[0075] In sample 2, the value of f is less than the minimum value of its set range 0mm≤f≤5mm. After disassembling the battery, it was found that the electrode assembly at the connection plate 3131 was damaged by pressure, and the electrode sheet of the electrode assembly was shedding powder, which posed a short circuit risk and resulted in a defective product.

[0076] In samples 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13, the value of e was within its set range of 0.5mm ≤ e ≤ 20mm, and the value of f was within its set range of 0mm ≤ f ≤ 5mm. After disassembling the battery, it was found that the separator covering the electrode assembly was intact, the electrode assembly was not damaged, and the tabs were in good shape within the battery casing 100, with no risk of short circuit. The product was in good condition.

[0077] In sample 14, the value of e is greater than the maximum value of its set range of 0.5mm≤e≤20mm. CT test shows that the shape of the tab inside the battery casing 100 is poor. The tab may be inserted upside down into the electrode group, which poses a risk of short circuit in the electrode group. The product is defective.

[0078] In sample 15, the value of f is greater than the maximum value of its set range 0mm≤f≤5mm. The size of the second plastic body 310 inside the battery housing 100 along the second direction is large, which causes waste of internal space in the battery housing 100, reduces the arrangement space of the electrode group, and results in low space utilization of the electrode group inside the battery housing 100. The energy density of the battery is low and its use is not recommended. The product is defective.

[0079] As an alternative solution, see Figure 2 and Figure 3 In this embodiment, the battery casing 100 is provided with two electrode groups as an example. The length direction of each electrode group (the third direction, i.e.) Figure 2 , Figure 3 A positive electrode and a negative electrode are respectively provided at both ends of the electrode group (in the X-axis direction shown). The positive electrodes of the two electrode groups are located on the same side, and the negative electrodes of the two electrode groups are located on the same side. Two first plastic parts 200 and two electrode posts are provided. The two first plastic parts 200 are respectively located on the top wall 110 along the third direction (in the X-axis direction shown). Figure 2 At both ends of the X-axis direction shown, the poles of the two first plastic parts 200 on the side away from the top wall 110 are the positive pole and the negative pole, respectively. Each first plastic part 200 has two first through holes 211 on its first plastic body 210. The two first through holes 211 allow the positive pole tabs of the two pole groups to pass through, or the two first through holes 211 allow the negative pole tabs of the two pole groups to pass through.

[0080] The second plastic part 300 is provided with two second through holes 311 at each end along a third direction, that is, there are four second through holes 311 in total. Each second through hole 311 is provided with a tab shaping structure 312 around its circumference. The first through hole 211, the second through hole 311 and the tab shaping structure 312 correspond one-to-one. The positive tab of each electrode group passes through a tab shaping structure 312, a second through hole 311, a first mounting hole 111 and a first through hole 211 and then connects to the positive terminal. The negative tab of each electrode group passes through the tab shaping structure 312, the second through hole 311, the first mounting hole 111 and the first through hole 211 at the other end of the second plastic part 300 along a third direction and then connects to the negative terminal. In this way, the tabs of the electrode group are led out from inside the battery housing 100 and connected to the terminal on the outside of the battery housing 100, without occupying the internal space of the battery housing 100, resulting in high space utilization and large volumetric energy of the electrode group. It should be noted that each electrode tab is provided with an electrode tab shaping structure 312 to ensure that each electrode tab has a good shape and is not prone to short circuit with the top wall 110.

[0081] Optionally, multiple support structures 313 are provided in this embodiment. Two support structures 313 are respectively located at both ends of the second plastic part 300 along the first direction and connected to the tab shaping structure 312 on one side therewith. The remaining support structures 313 are arranged between two adjacent tab shaping structures 312 along the first direction. One or more support structures 313 may be provided between each pair of tab shaping structures 312. Here, we will take one support structure 313 between each pair of tab shaping structures 312 as an example. That is, support structures 313 are provided on both sides of each tab shaping structure 312 along the first direction for support. The multiple support structures 313 described above can provide good support for the tab shaping structure 312, ensuring that the tab shaping structure 312 has high mechanical strength and is not easily deformed.

[0082] In some embodiments, in the support structure 313 located near the end of the second plastic body 310 along the first direction, one end of the connecting plate 3131 is connected to the tab shaping structure 312, and the other end of the connecting plate 3131 is connected to the support plate 3132. The support plate 3132 is connected to the edge of the connecting plate 3131 near the second plastic body 310 along the first direction. The support plate 3132 is disposed on the end face of the connecting plate 3131 near the top wall 110. The support plate 3132 abuts against the top wall 110, thereby providing support for the tab shaping structure 312 connected thereto. In the support structure 313 located between two adjacent tab shaping structures 312, the two ends of the connecting plate 3131 are respectively connected to the end of the guide plate 3121 of one tab shaping structure 312 near the pole group. The support plate 3132 is connected to the middle of the connecting plate 3131 and is disposed on the end face of the connecting plate 3131 near the top wall 110. The support plate 3132 abuts against the top wall 110, thereby providing support for the two adjacent tab shaping structures 312.

[0083] Further, see Figures 4-6 The first plastic part body 210 has a circumferentially circumferentially lapped portion 220, and the top wall 110 has a recessed groove 112 on the end face opposite to the second plastic part 300. The lapped portion 220 is embedded in the recessed groove 112 and fits against the bottom wall of the recessed groove 112. On the one hand, the lapped portion 220 can be arranged along the axial direction of the first mounting hole 111 (i.e., Figure 6 The first plastic part 200 is limited by the Z-axis direction shown in the figure to ensure accurate positioning between the first plastic part 200 and the top wall 110; on the other hand, by setting the sink 112, the size of the battery housing assembly along the second direction can be further reduced, thereby improving the space utilization of the whole battery pack and increasing the energy density.

[0084] Optionally, along the second direction ( Figure 6(In the Z-axis direction shown), the thickness of the top wall 110 is H. The distance between the end face of the overlapping portion 220 away from the second plastic part 300 and the end face of the top wall 110 away from the second plastic part 300 is b. The value of b satisfies the following range: -1mm ≤ b ≤ 0.5H, 1mm ≤ H ≤ 3mm. Here, "-" indicates that the end face of the overlapping portion 220 away from the second plastic part 300 extends beyond the end face of the top wall 110 away from the second plastic part 300. For example, when H is 1mm, the value of b can be -1mm, -0.5mm, 0mm, or 0.5mm. It should be noted that the value of b should not be too large. If the value of b is greater than 0.5H, the depth of the recess 112 will be large, affecting the mechanical strength of the top wall 110. When the top wall 110 is impacted, it is prone to deformation or cracking, leading to battery failure. Of course, the value of b should not be too small. If the value of b is less than -1mm, the end face of the overlapping part 220 away from the second plastic part 300 will extend too far beyond the end face of the top wall 110 away from the second plastic part 300, which is not conducive to improving space utilization and may affect the assembly between the first plastic part 200 and other structural parts. Of course, in other embodiments, the value of H can also be 2mm, 2.5mm or 3mm, etc., and the value of b is taken within the above range, which will not be listed here one by one.

[0085] Further, see Figure 6 and Figure 8 Along the first direction ( Figure 7 The Y-axis direction shown) and the third direction ( Figure 5 In the X-axis direction shown, the width of the overlapping portion 220 is always c, and the value of c is within the range of 0mm ≤ c ≤ 10mm. For example, the value of c can be 0mm, 1mm, 2mm, 5mm, 8mm, or 10mm. By controlling the width c of the overlapping portion 220 within the above range, the assembly structure between the first plastic part 200 and the top wall 110 can be kept stable, and the weight of the first plastic part 200 can be relatively reduced, thus lowering material costs. It should be noted that when the width c of the overlapping portion 220 is 0mm, the circumferential edge of the first plastic part body 210 overlaps with the top wall 110, which also ensures successful assembly of the first plastic part 200 and the top wall 110. However, when the width c of the overlapping portion 220 is greater than 10mm, it may occupy more space in the recess 112, affecting the assembly between the top wall 110 and other structural components, and increasing costs.

[0086] The following tests, using battery samples of different sizes, examine the dimensional design of the overlap portion 220 and the battery casing 100 to investigate the effects of the parameters H, b, and c on the insulation performance and structural strength of the battery.

[0087] The withstand voltage test refers to applying a high voltage (e.g., 1500V) between the battery casing 100 and the first plastic part 200 using an AC withstand voltage tester for 2 seconds, and then detecting the leakage current value. When the leakage current value is less than 2mA and the first plastic part 200 is not broken down, the battery has good insulation performance.

[0088] The thrust test refers to fixing the battery casing 100 and applying a thrust toward the first plastic part 200. When the thrust applied to the first plastic part 200 is greater than 1200N, and the deformation of the battery casing 100 along the thrust direction is less than 0.5mm, the structural strength of the battery casing 100 is high and meets the product requirements.

[0089] The detailed dimensions and test results of the battery are shown in Table 3 below.

[0090] Table 3

[0091]

[0092] In sample 1, the value of b is -2.0 mm and the value of H is 2.0 mm. The value of b is less than the minimum value of -1 mm ≤ b ≤ 0.5 H. At this time, the end face of the overlapping part 220 away from the second plastic body 310 exceeds the end face of the top wall 110 away from the second plastic body 310 by too much. This affects the height design of the electrode post along the second direction, which is not conducive to improving the energy density of the battery. It is not recommended to use it, and the product is defective.

[0093] In sample 2, the value of c is -0.5mm, which is less than the minimum value of 0mm≤c≤10mm. Other parameters H and b meet their corresponding size range limits. At this time, the insulation performance between the first plastic part 200 and the top wall 110 cannot be guaranteed, the pressure resistance test fails, there is a risk of pressure resistance failure, it is not recommended to use, and the product is defective.

[0094] In samples 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15, the values ​​of parameters H, b, and c all meet their respective size range limitations. At this time, the insulation performance between the first plastic part 200 and the top wall 110 is good, the pressure resistance test is passed, and the structural strength of the battery casing 100 is high, the thrust test is passed, and it is recommended to use the product, which is of good quality.

[0095] In sample 16, the value of c is 13.0 mm, which is greater than the maximum value of 0 mm ≤ c ≤ 10 mm. Other parameters H and b meet their corresponding size range limits. At this time, the insulation performance between the first plastic part 200 and the top wall 110 is good, and the withstand voltage test is passed. However, the width of the overlap 220 of the first plastic part 200 is large, which increases the material usage of the first plastic part 200 and the pole, resulting in higher costs. It is not recommended to use this product, which is defective.

[0096] In sample 17, the value of b is 1.5 mm and the value of H is 2.0 mm. The value of b is greater than 0.5 H, which does not meet the size limit of -1 mm ≤ b ≤ 0.5 H. At this time, the opening depth of the groove 112 on the top wall 110 is too large, the structural strength of the battery casing 100 is low, the thrust test is not passed, and it is not recommended to use the product.

[0097] See Figure 8 and Figure 10 The first plastic body 210 has a first flange 230 on the side near the top wall 110. The first flange 230 is located circumferentially in the first through hole 211 and extends into the first mounting hole 111. The second plastic body 310 has a second flange 320 on the side near the top wall 110. The second flange 320 is located circumferentially in the second through hole 311 and extends into the first mounting hole 111. The second flange 320 and the first flange 230 are interlocked. One of the first flange 230 and the second flange 320 is in contact with the inner wall of the first mounting hole 111, and both the first flange 230 and the second flange 320 are located between the tab and the top wall 110. Thus, there is a double-layer insulation structure between the tab and the top wall 110, the insulation effect between the tab and the top wall 110 is good, and the battery safety is high.

[0098] For example, in this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the second flange 320, the second flange 320 is sleeved outside the first flange 230, and the peripheral sidewall 120 of the second flange 320 is in contact with the inner wall of the first mounting hole 111, and the peripheral sidewall 120 of the first flange 230 is in contact with the inner wall of the second flange 320. In this case, the tab is accommodated within the first through hole 211, the insulation between the tab and the top wall 110 is good, and the battery has good safety.

[0099] Optionally, the first plastic body 210 has a third flange 250 and a connecting rib 240 on the side opposite to the second plastic body 300. The third flange 250 is disposed circumferentially around the first through hole 211, and the extension direction of the third flange 250 is opposite to that of the first flange 230. There are two third flanges 250 and two connecting ribs 240, and each first through hole 211 has a ring-shaped third flange 250 circumferentially. The two ends of each connecting rib 240 are respectively connected to the two third flanges 250. The third flange 250, the connecting rib 240 and the first plastic body 210 form a mounting groove 241, and at least a portion of the electrode post is embedded in the mounting groove 241. The flat electrode post is at least partially embedded in the mounting groove 241, thereby further reducing the size of the battery housing assembly along the second direction, so as to improve space utilization and increase the energy density of the entire battery pack.

[0100] As an alternative, in this embodiment, the first plastic part 200 and the battery casing 100, as well as the second plastic part 300 and the battery casing 100, can be fixed by heat fusion.

[0101] Specifically, see Figure 2 , Figure 3 and Figure 6 A first fixing groove 113 is provided on the bottom wall of the settling tank 112. A first fusion column 260 is provided on the end face of the first plastic part body 210 facing the top wall 110. The first fusion column 260 is inserted into the first fixing groove 113. One end of the first fusion column 260 inserted into the first fixing groove 113 is locked into the first fixing groove 113 by ultrasonic heat fusion, thereby realizing the connection between the first plastic part 200 and the top wall 110. Optionally, the first fixing groove 113 can be set as a straight groove, a trapezoidal groove with a gradually narrowing inlet, or a stepped groove, so as to improve the connection strength between the first fusion column 260 and the first fixing groove 113. In addition, the bottom wall of the settling tank 112 can be provided with multiple first fixing grooves 113, and correspondingly, multiple first fusion columns 260 are also provided on the first plastic part body 210. The first fixing grooves 113 and the first fusion columns 260 correspond one-to-one, which improves the connection strength between the top wall 110 and the first plastic part body 210, and also improves the uniformity of the force on the first plastic part 200.

[0102] For example, in this embodiment, two first molten pillars 260 are provided on the end face of the first plastic part body 210 facing the top wall 110, and two first fixing grooves 113 are correspondingly provided in the sink 112. Of course, in other embodiments, the number and arrangement of the first molten pillars 260 and the first fixing grooves 113 can be flexibly adjusted as needed, and this embodiment does not limit this.

[0103] Further, see Figure 2 , Figure 3 and Figure 9A second fixing groove (not shown in the figure) is provided on the end face of the top wall 110 facing the second plastic part 300. A second fusion column 330 is provided on the end face of the second plastic part body 310 facing the top wall 110. The second fusion column 330 is inserted into the second fixing groove. One end of the second fusion column 330 inserted into the second fixing groove is locked into the second fixing groove by ultrasonic heat fusion, thereby realizing the connection between the second plastic part 300 and the top wall 110. Optionally, the second fixing groove can be set as a straight groove, a trapezoidal groove with a gradually narrowing inlet, or a stepped groove, so as to improve the connection strength between the second fusion column 330 and the second fixing groove. In addition, multiple second fixing grooves may be provided on the end face of the top wall 110 facing the second plastic part 300. The multiple second fixing grooves are arranged at intervals near the periphery of the top wall 110. Correspondingly, multiple second molten pillars 330 are also provided on the body of the second plastic part 310. The multiple second molten pillars 330 are arranged at intervals near the periphery of the body of the second plastic part 310. The second fixing grooves and the second molten pillars 330 correspond one to one, thereby improving the connection strength between the top wall 110 and the body of the second plastic part 310, and also improving the uniformity of the force on the second plastic part 300.

[0104] For example, in this embodiment, six second molten pillars 330 are provided on the end face of the second plastic body 310 facing the top wall 110, and six second fixing grooves are correspondingly provided on the top wall 110. Of course, in other embodiments, the number and arrangement of the second molten pillars 330 and the second fixing grooves can be flexibly adjusted as needed, and this embodiment does not limit this.

[0105] Optionally, see Figure 2 and Figure 3 The battery housing assembly in this embodiment also includes an explosion-proof valve 400. A second mounting hole 115 is provided on the top wall 110, and the explosion-proof valve 400 is disposed within the second mounting hole 115; a vent 340 is provided on the second plastic body 310 corresponding to the position of the second mounting hole 115, extending along the second direction ( Figure 2 , Figure 3 The projection of the vent 340 (in the Z-axis direction shown) onto the top wall 110 coincides with the projection of the explosion-proof valve 400 onto the top wall 110. Therefore, when the pressure inside the battery housing 100 exceeds the opening pressure of the explosion-proof valve 400, high-temperature, high-pressure gases and liquids can be discharged from the battery housing 100 through the vent 340 and the explosion-proof valve 400, avoiding the risk of explosion and ensuring high safety. Furthermore, the second mounting hole 115 is also provided with crisscrossing support ribs 116, which can support the battery housing 100 and improve the structural strength of the battery housing 100 at the location of the second mounting hole 115. Moreover, multiple vent holes 340 on the second plastic body 310 can be spaced apart to increase the flow area, allowing high-temperature, high-pressure gases and liquids to be discharged quickly and smoothly.

[0106] Furthermore, in this embodiment, the two first plastic parts 200 and the second plastic part 300 are separately configured, and each component is injection molded individually. In other embodiments, the two first plastic parts 200 and the second plastic part 300 can also be an integral structure, directly injection molded on the top wall 110. It should be noted that in this solution, the first plastic parts 200 and the second plastic part 300 are not easily removed completely from the top wall 110.

[0107] Optionally, in some embodiments, a first injection hole 117 is provided on the top wall 110, and a second injection hole (not shown in the figure) is provided on the second plastic body 310 at a position corresponding to the first injection hole 117. The projection of the first injection hole 117 on the top wall 110 along the second direction coincides with the projection of the second injection hole on the top wall 110. Electrolyte can be injected into the mounting cavity of the battery housing 100 through the first injection hole 117 and the second injection hole, so that the electrode assembly can be immersed in the electrolyte. After the injection is completed, an injection plug can be inserted into the first injection hole 117 and / or the second injection hole to seal the first injection hole 117 and / or the second injection hole and prevent electrolyte leakage. Exemplarily, the injection plug is made of a material with elastic deformation capability, such as rubber.

[0108] This embodiment also provides a battery, including a cover plate, an electrode assembly, and the aforementioned battery housing assembly. The cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the electrode assembly within the mounting cavity of the battery housing 100. The electrode tabs of the electrode assembly can be led out through the battery housing assembly and connected to an external circuit via terminals on the outside of the battery housing 100, so that the electrode assembly can supply power to the external circuit or store energy.

[0109] By adopting the above-described battery casing assembly, the space utilization rate within the mounting cavity of the battery casing 100 is high, the volume of the electrode assembly is increased, and the energy density of the battery is high. Furthermore, the tab shaping structure 312 on the second plastic body 310 can retract the tabs into the second through hole 311, resulting in a good overall shape of the tabs and reducing the likelihood of short-circuit contact with the battery casing 100, thus ensuring good battery safety. In addition, the presence of two layers of insulation structure—a first flange 230 and a second flange 320—between the tabs and the battery casing 100 provides excellent insulation performance, making the battery casing assembly safer and more reliable.

[0110] Example 2

[0111] This embodiment provides a battery housing assembly, which differs from the battery housing assembly in Embodiment 1 in that the assembly structure between the first flange 230 and the second flange 320 in the battery housing assembly is different.

[0112] See Figure 11 and Figure 12In this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the first flange 230. The first flange 230 is fitted over the second flange 320. The peripheral sidewall 120 of the first flange 230 fits against the inner wall of the first mounting hole 111, and the peripheral sidewall 120 of the second flange 320 fits against the inner wall of the first flange 230. The electrode tab is accommodated within the first through hole 211 and the second through hole 311. There are also two layers of insulation structure (first flange 230 and second flange 320) between the electrode tab and the battery casing 100, providing good insulation and ensuring good battery safety.

[0113] This embodiment also provides a battery, including a cover plate, an electrode assembly, and the aforementioned battery housing assembly. The cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the electrode assembly within the mounting cavity of the battery housing 100. The electrode tabs of the electrode assembly can be led out through the battery housing assembly and connected to an external circuit via terminals on the outside of the battery housing 100, so that the electrode assembly can supply power to the external circuit or store energy.

[0114] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0115] Example 3

[0116] This embodiment provides a battery housing assembly, which differs from the battery housing assembly in Embodiment 1 in that the assembly structure between the first flange 230 and the second flange 320 in the battery housing assembly is different.

[0117] See Figure 13 and Figure 14 In this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the first flange 230, the outer diameter of the first flange 230 is greater than the outer diameter of the second flange 320, and the inner diameter of the first flange 230 is smaller than the inner diameter of the second flange 320. A first insertion groove 231 is provided on the end face of the first flange 230 facing the second plastic part 300. The second flange 320 extends into the first insertion groove 231 along the radial direction of the first mounting hole 111. Figure 13 (As shown in the Y-axis direction), the two sides of the second flange 320 are respectively attached to the sidewalls of the first insertion groove 231, and the peripheral sidewall 120 of the first flange 230 is attached to the inner wall of the first mounting hole 111. The electrode is accommodated in the first through hole 211. There are two layers of insulation structure (first flange 230 and second flange 320) between the electrode and the top wall 110, which has good insulation effect and high battery safety. Furthermore, through the cooperation of the first insertion groove 231 and the second flange 320, the positioning between the first plastic part 200 and the second plastic part 300 can be accurately guaranteed, and the assembly precision is high.

[0118] This embodiment also provides a battery, including a cover plate, an electrode assembly, and the aforementioned battery housing assembly. The cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the electrode assembly within the mounting cavity of the battery housing 100. The electrode tabs of the electrode assembly can be led out through the battery housing assembly and connected to an external circuit via terminals on the outside of the battery housing 100, so that the electrode assembly can supply power to the external circuit or store energy.

[0119] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0120] Example 4

[0121] This embodiment provides a battery housing assembly, which differs from the battery housing assembly in Embodiment 1 in that the assembly structure between the first flange 230 and the second flange 320 in the battery housing assembly is different.

[0122] See Figure 15 and Figure 16 In this embodiment, the inner diameter of the first mounting hole 111 is equal to the outer diameter of the second flange 320, the outer diameter of the second flange 320 is greater than the outer diameter of the first flange 230, and the inner diameter of the second flange 320 is smaller than the inner diameter of the first flange 230. A second insertion groove 321 is provided on the end face of the second flange 320 facing the first plastic part 200. The first flange 230 extends into the second insertion groove 321 along the radial direction of the first mounting hole 111. Figure 15 (As shown in the Y-axis direction), the two sides of the first flange 230 are respectively attached to the sidewalls of the second insertion groove 321, and the peripheral sidewall 120 of the second flange 320 is attached to the inner wall of the first mounting hole 111. The electrode tab is accommodated in the first through hole 211 and the second through hole 311. There are two layers of insulation structure (first flange 230 and second flange 320) between the electrode tab and the top wall 110, which has good insulation effect and high battery safety. Furthermore, the cooperation between the second insertion groove 321 and the first flange 230 can ensure accurate positioning between the first plastic part 200 and the second plastic part 300, and high assembly precision.

[0123] This embodiment also provides a battery, including a cover plate, an electrode assembly, and the aforementioned battery housing assembly. The cover plate is connected to the opening 121 of the battery housing 100 to encapsulate the electrode assembly within the mounting cavity of the battery housing 100. The electrode tabs of the electrode assembly can be led out through the battery housing assembly and connected to an external circuit via terminals on the outside of the battery housing 100, so that the electrode assembly can supply power to the external circuit or store energy.

[0124] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0125] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery casing assembly, characterized in that, include: The battery casing has a hollow interior forming a mounting cavity. One side of the battery casing has an opening communicating with the mounting cavity. The electrode assembly is inserted into the mounting cavity through the opening. One wall of the battery casing is provided with a first mounting hole. A first plastic component is disposed outside the mounting cavity. The first plastic component includes a first plastic component body, and the first plastic component body is provided with a first through hole. The second plastic part is disposed in the mounting cavity. The second plastic part includes a second plastic part body, on which a second through hole and a tab shaping structure are provided. The tab shaping structure is disposed in the circumferential direction of the second through hole, and the tab shaping structure is located on the side of the second plastic part body away from the battery casing. The electrode post is located on the side of the first plastic part away from the battery casing. The electrode tabs of the electrode group pass through the second through hole, the first mounting hole and the first through hole and are connected to the electrode post. The battery housing includes a top wall and a peripheral side wall, the top wall and the peripheral side wall forming the mounting cavity, and the top wall is provided with the first mounting hole; The electrode tab shaping structure includes two guide plates, which are respectively disposed on both sides of the second through hole. The two guide plates are inclined in a direction away from the axis of the second through hole. Along the direction away from the second through hole, a flared mouth with a gradually widening opening is formed between the two guide plates. The larger end of the flared mouth faces the electrode assembly, and the smaller end of the flared mouth is connected to the second plastic body. The electrode tab is inserted into the flared mouth. The included angle between the guide plate and the axis of the second through hole is α, and the value of α is in the range of 45°≤α≤87°.

2. The battery casing assembly according to claim 1, characterized in that, The second plastic part body has a support structure on the side near the top wall. The support structure includes a connecting plate and a support plate. The connecting plate is connected to the tab shaping structure. The support plate is disposed on the end face of the connecting plate near the top wall and abuts against the top wall. Wherein, along the first direction, the distance between the end face of the support plate away from the guide plate and the end of the guide plate near the support plate is e, and the value of e is in the range of 0.5mm≤e≤20mm; And / or, along the second direction, the distance between the end face of the connecting plate away from the top wall and the end face of the second plastic part body away from the top wall is f, and the value of f is in the range of 0mm≤f≤5mm.

3. The battery casing assembly according to claim 1, characterized in that, The first plastic part body has an overlapping part in the circumference, and the top wall has a groove on the end face opposite to the second plastic part. The overlapping part is embedded in the groove and fits against the bottom wall of the groove. Wherein, along the second direction, the thickness of the top wall is H, and the distance between the end face of the overlapping part away from the second plastic part and the end face of the top wall away from the second plastic part is b, and the value range of b satisfies: -1mm≤b≤0.5H, 1mm≤H≤3mm; And / or, along the first direction and the third direction, the width of the overlapping portion is c, and the value of c is within the range of: 0mm≤c≤10mm.

4. The battery casing assembly according to claim 1, characterized in that, The first plastic part body has a first flange on the side near the top wall. The first flange is disposed in the circumference of the first through hole and extends into the first mounting hole. The second plastic part body has a second flange on the side near the top wall. The second flange is disposed in the circumference of the second through hole and extends into the first mounting hole. The second flange and the first flange are fitted together. One of the first flange and the second flange is in contact with the inner wall of the first mounting hole.

5. The battery casing assembly according to claim 1, characterized in that, The first through hole on the first plastic part body is provided with multiple spacings, and the second through hole and the tab shaping structure on the second plastic part body are provided with multiple spacings, and the first through hole, the second through hole and the tab shaping structure correspond one-to-one.

6. The battery housing assembly according to claim 5, characterized in that, The first plastic part body has a third flange and a connecting rib on the side opposite to the second plastic part. The third flange is disposed in the circumference of the first through hole. The two ends of the connecting rib are respectively connected to two adjacent third flanges. The third flange, the connecting rib and the first plastic part body form a mounting groove. At least a portion of the pole post is embedded in the mounting groove.

7. The battery housing assembly according to claim 1, characterized in that, The first plastic part is heat-fused to the battery casing, and the second plastic part is heat-fused to the battery casing.

8. A battery, characterized in that, The battery housing assembly includes a cover plate, an electrode assembly, and any one of claims 1-7, wherein the cover plate is connected to an opening in the battery housing, and the electrode assembly is encapsulated within a mounting cavity of the battery housing.

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